- 话题:Writing:imagineascenarioorexpressyouropinionOptimalOptimalmeansthemostadvantageoussetting,takingintoaccountmostfactors.Whatisoptimal?Howisitoptimal?Thisweek'stopic:Theysearchedfortheoptimalsetting...(90-110words)Suggestions:1)optimalheatsetti...
- 29086